http://www.biology.arizona.edu/cell_bio/tutorials/cytoskeleton/main.html
A tutorial on the cytoskeleton, including an online quiz.
https://sites.duke.edu/kinesin/
The structure and function of this molecular motor.
http://www.cellmigration.org/index.shtml
Site of the Cell Migration Consortium, with links to studies on cell motion.
http://www.biology-pages.info/C/Cytoskeleton.html
Overview with illustrations of the cytoskeletal components.
Gallery: Actin and Tubulin Probes
http://www.thermofisher.com/us/en/home/technical-resources/research-tools/image-gallery.html
Beautiful photos of the cytoskeleton stained with fluorescent probes.
https://ghr.nlm.nih.gov/primer/genefamily/myosins
Discussion of myosins, including muscle and nonmuscle myosins.
http://www.cytochemistry.net/cell-biology/intermediate_filaments.htm
Well-illustrated summary of the formation, structure, and roles of intermediate filaments.
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